Stamp-mill.



means of wedges or keys.

. UNTTED. sTATEs PATENT oEEioE.

PETER KIRKEGAARD, OF DELORO, ONTARO, CANADA.

STAMP-MILLl To a/ZZ whom t may con/cern,.-

Be it known that I, PETER KIRKEGAARD, a citizen of the United States, residing at Deloro, in the county of Hastings, Ontario, Dominion of Canada, have invented certain new and useful Improvements in Stamp- Mills, of whichthe following is a full, clear, and exact description.

The present mode of securing tappets to stamp -stems in ore-crushing mills is by The use of wedges and keys is objectionable from the fact that the keys or wedges must be driven in very hard in order to have the necessary friction or grip required to hold the tappet securely on the stem. against the'blow and lifting effect of the stamp by the cam and the natural tendency of the tappet to slip down by virtue of its own weight and the shock when the stamp strikes the die.

Another very serious objection is that the constant hard driving of the keys or wedges swells and burs the latter, causing long,seri ous, and costly delaysy in moving tappets, while very frequentlyv the swelling of the keys causes a splitting of the tappets, thus destroying' them and necessitating the stopping of a whole -battery of stamps to facili- `tate renewal.

In manipulating tappets as at present constructed there is great difficulty by reason of their 'natural close proximity to each other,

. makingit at times well nigh impossible to get out thevv keys, thus leading to "missed yblows of the'hammer, burring up of keys, and

other attendant evils.

It will be understood that every moment a stamp is out of operation means a corresponding reduction in the output, and in large plants these small delays multiplied become very serious. This feature becomes a important in view of the fact that the position of tappets on stamp-stems'is changed at frequent intervals, for which reason it is important to have a quick and reliable method of accomplishing the change.

My invention is designed to avoid and obviate the above-named defects and to facilitate the handling of stamps, the quick moveand by these means greatly increasing the k,eiiciency of ore-crushing 'stamp-mills.

Specication of Letters Patent.

Application filed September 17, 1904. Serial No. 224.883.

Patented Oct. 30, 1906.

More specifically, the object of this invention is to provide quick and reliable means for fastening the tappets of stamp-mills securely on the stems of stamps in any desired position to do away with the keys or wedges now universally used and to greatly facilitate the setting of stamps in relation to the cams and byr these means to regulate the drop of the stamps.

The invention is illustrated in the accompanying drawings, in whichg Figure 1 is a longitudinal section of a tappet as applied to a stamp-stem, the latter being shown in full lines. Fig. 2 is an elevation of a tappet applied to a stamp-stem, the view being taken at right angles to that shown in Fig. 1. Fig. 3 is a transverse section of a tappet and a stamp-stem to which the tappet is applied. Figs. 4 and 5 are detailv views. Figs. 6 and 7 are views corresponding, respectively, to Figs. 1 and 2, but illustrating a modified form of locking and unlocking means for the tappet. Figs. 8 and 9 are respectively similar views showing still other modifications; and Figs. 10, 11, and 12 are further detail views.

Referring to the earlier figures ofthe drawings, 1 is a stamp-stem, and 2 the tappet applied thereto. The means for fastening the tappet to the stem consist of eccentric disks 4, 5, and 6, provided withv holes o r openings 7, to which a suitable tool may be applied for bringing the eccentrics to bear upon a gib 3, interposed between the eccentrics and the stem. The eccentrics are mounted upon short shafts or axles S 8k 8, mounted in lips or flanges 9 9 on the ta pet.

By referring to Fig.. 5, it will be seen that the faces of the eccentrics (one such eccentric being shown in the said gure) are slightly rounded for the purpose of reducing friction to a minimum.

motion of the tool which operates them,v

while the eccentric 5 is adapted to exert a similar influence by an upward motion of its operating-tool. By virtue of this arrange- ICO ment the eccentrics 4 and 6 are in apposition such that when forcedvhome they tend to clamp themselves still further when the tappet is being lifted by the cam, whereas the eccentric 5 tends to tighten itself against any tendency there might be of the tappet slipping due to its own weight when the stamp strikes the die.

It is obvious that the arrangement of these eccentric disks may be reversed and all may be made to tighten in one direction or any two in one direction with any one in the opposite direction.

It is also obvious that the eccentric or roll-v ing wedges 4 5 6 may be used for fastening pulleys on shafts or the like and that the eccentrics may be used with or without handles attached without departing from the spirit of the present invention.

The gib 3 is made concave, of a radius I slightly smaller than the diameter of the stamp-stem, for the purpose of more securely clamping the tappet in position, and the gib is also made to fit tightly within a recess 10, providedfor it in the tappet to obviate all tendency to'lateral movement.

To stiffen the gib 3 without unduly enlar ing it, grooves 11 are provided in it longitu inally `corresponding to each eccentric. This leaves eXtra metal around the recess or grooves to stiffen the gib and at the same time permits of the eccentric being made of as large a diameter as possible within the limit of what has been found by long practice to be a suitable size of tappets on any given weight of stamp.

The shafts or journals 8, upon which the eccentrics revolve, are made to fit snugly into the lips 9 9, while the eccentric disks are themselves made to fit loosely, so as to permit their moving without undue friction when necessary. The holes 7 7 7 serve as well for loosening as well as for tightening the eccentrics, an appropriate tool being applied in each instance.

YWhen the eccentrics are provided with short stems or handles, a wrench may be used for locking and unlocking the same. Such a constructionis shown in the latter figures of the drawings. One such eccentric is shown at 12 in Fig. 6. The upper eccentric in this figure is shown as being locked in positionby means of a post 13 and a key 14, the same being inserted between the lips 9 9 on the tappet 2. The lower eccentric 12 in Fig. 6 is shown as unlocked, but as being capable of being moved upward by its handle so as to exert pressure on the gib 3 and to be itself locked in position after having been forced home. 1

With the eccentric shown in Figs. 6 and 7, the mode of applying the said eccentric to the shafts or aXlesS is perfectly clear. Such application can be made readily without removing the shaftsor axles or disturbing the tappet or pulley in any way.

With the form of eccentric shown in Figs. 6 and 7, having a gap, as shown, it becomes easy to change the eccentrics without disturbing any other part, as will be clearly understood.

A double wrench 14/ is shown in Fig. S for the purpose of locking or unlocking the eccentrics. This wrench engages with an external prolongation of the shaft or axle S, upon which the eccentric lis journaled, one of the jaws of the wrench engaging with the said prolongation, while the other engages with a pin 15 upon the outer end of the handle of the eccentric. The wrench is so constructed that by simply turning it upside down it will present its greatest strength for either fastening or unfastening. It is obvious that two wrenches may be used at the same time, one on each side of the tappet, thus giving double leverage, if required at any time, and such leverage will be evenly balanced.

At 16 in Fig. S a gap is shown in the body of the tappet. This is for the purpose of receiving the pins 15 in the ends of the eccentric-handle when these are in the locked posi* tion, thereby protecting them within the circumference of the tappet against being caught by an adjacent tappet.

The recesses or grooves in the gib are made fiat, Fig. 11, both parallel and at right angles to the stamp-stem, and the gib is preferably hardened at these points for the purpose of resisting wear.

The clamping faces or edges of the eccentric are made slightly rounded or convex for the purpose of preventing undue friction and for the purpose of being fastened or unfastened and to give them a more secure grip, and these faces in both forms of eccentric are preferably hardened to withstand wear.

The side of the tappet in' which the gib and eccentrics are placed is made the full diameter of the working face of the tappet, and in this are the recesses for accommodating two or more eccentrics, as desired, and it is obvious that the sides or lips 9 9 can be made as heavy as desired to give the necessary strength and also that bridges, as 17 17, can be left for the same purpose.

For the disk eccentrics the wrench illustrated in Fig. 12 may be used. The action is obvious.-

I claim as my invention- 1. In a stamp-mill, a stamp-stem, a ta pet' thereon, a gib in the tappet, the said gib iiaving recesses parallel to its length and corresponding to the position and number of eccentrics, and one or more eccentrics secured in the tappet and adapted to press the gib against the stem.

2. In a stamp-mill, a stamp-stein, a tappet thereon, a gib 1n the tappet and one or more eccentrics adapted to press the gib against the stem.

3. In a stamp-mill, a stamp-stem, a ta pet thereon, a gib in the tappet, the said gib having recesses parallel to its length, and one or IOC IIO

its end for engaging vvith a Wrench or tool more eccentrics bearing on said gib.

morey eccentrics secured in the tappet and l u 5. In a stamp-mill, a stamp-stem, a tappet eccentrics bearing on said gib having means for fastening and unfastening the same.

6. In a stamp-mill, a stamp-stem, a tappet thereon, a gib in the tappet, and one or morev eccentrics bearing on said gib, the said eccentric or eccentrics being provided with a handle or handles, each handle having a pin at When lockin'gor unlocking.

7.- In a stamp-mill, a stamp-stem, a tappet thereon, a gib inthe tappet and eccentrics having a rounded Working face engaging said ib. g 8. In a stamp-mill, a stamp-stem, a tappet thereon, a gib in the, tappet, andeccentrics having rounded Working faces bearing on said gib, the said working faces being hardened to reduce Wear and insure smoothness.

9. In a stamp-mill, a stamp-stem, a tappet thereon, a gib in the tappet, and reversible eccentrics forA pressing the gib against the stern. f

10. In a stamp-mill, a stamp-stem, a tap- `pet thereon, a gib in the tappet, and one or more eccentrics for pressing the gib against the stem, the said eccentrics being supported pet thereon, a gib eccentrics for pressing the gib against the stem, the said tappet having upon one side -lips in which recesses are formed for accornf modating the eccentric or eccentrics, and the said lips being also receiving pins in the ends of the eccentricl handles.

pon shafts or axles firmly secured in the tappet and affording free motion to the eccentrics u on them.

11. n a stamp-mill, a stamp-stem, a tappet thereon, a glb in the tappet, and one or more eccentrics for the stem, the eccentrlcs being supported upon shafts or axles firmly secured in the tappet, and affording free trics upon them, and the extended so as to afford fulcrums to Wrenches for fastening or unfastening the eccentric.

pressing the gibagainst motion to the eccenshafts or axles being `12. In a' stamp-mill, a stamp-stem, a tappet thereon, a gib in thetappet, one or more eccentrics for pressing stem,the said tappet being reinforced by having upon one side lips in which recesses are formed for accommodating the eccentric or eccentrics.

the gib against the 13. In a stamp-mill, a stamp-stem, a tapin the tappet, one or more provided With a gap for Inwitness whereof I subscribe my ,signature in thepresence of tWo Witnesses.

PETER KrRKEmmRD.

Witnesses:

W. A. HUNGERFORD, G. FRANK FRIEs. 

